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pH
Orion 8003, 8165,
8172, 8175
Orion ROSS
®
Sure-Flow Electrodes
INSTRUCTION MANUAL
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Sure-Flow electrodes are protected by European Patent 278,979
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ionplus electrodes and Optimum Results solutions are protected by
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© Copyright 2003, Thermo Electron Corporation. All rights reserved. Question
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The specifications, descriptions, drawings, ordering information and part
numbers within this document are subject to change without notice.
This publication supersedes all previous publications on this subject.
TABLE OF CONTENTS
General Information
1
Introduction
Required Equipment
Required Solutions
1
2
2
Using the Electrode
3
Electrode Preparation
Sample Requirements
Placement of Removable Bulb Guard
Sure-Flow® Junction
Measuring Hints
pH Calibration & Measurement
General Calibration Procedure
Two-Buffer Calibration
Single Buffer Calibration
pH Measurement
Electrode Maintenance
Cleaning Electrode
Removal of Membrane/Junction Deposits
Electrode Storage
Troubleshooting
3
4
5
5
6
7
7
7
8
8
8
8
9
9
11
Troubleshooting Guide
Assistance
11
12
Electrode Characteristics
13
Temperature Effects
Electrode Leak Rate
Interferences
13
13
14
Warranty
15
Ordering Information
19
Specifications
21
GENERAL INFORMATION
Introduction
This manual contains instructions for the ROSS™ Sure-Flow® Series
of pH electrodes. Operation and maintenance instructions for the
following electrodes are included:
Orion
Description
8003
ROSS Sure-Flow Reference Half-Cell,
glass body
8165
ROSS Sure-Flow Combination, epoxy body
8172
ROSS Sure-Flow Combination, glass body
8175
ROSS Sure-Flow Semi-Micro Combination,
epoxy body
ROSS Sure-Flow Electrodes provide a free-flowing sleeve junction
especially designed for measurement in general pH samples as well
as viscous or colloidal samples whenever best performance is
desired. The junction can be cleaned easily between measurements;
pressing down on the cap allows filling solution to flow through
the junction, carrying away any contamination that may interfere
with measurement.
The Models 8165 and 8175 combine the Sure-Flow junction with a
rugged epoxy body. A sleeve protects the pH sensing bulb and is
removable for easy cleaning. The rugged epoxy body is resistant to
strong acids and strong bases. It may be used intermittently in
some organics. Polar organic compounds should be strictly avoided
(Orion 8172BN is recommended for use in organics).
The Ross series of electrodes provide readings stable to 0.01 pH in
a buffer solution in less than 30 seconds, even in the extreme case
of buffers varying from one another by 50 ˚C or more. Results are
three to five times more precise than those obtained with
conventional electrodes.
ROSS Sure-Flow Electrodes are supplied with BNC connectors.
Adaptors are available for conversion to U.S. Standard connectors.
See Ordering Information, or consult the Thermo Electron
Corporation Laboratory Products Catalog and price list. For more
information contact your local Thermo Distributor, or call Thermo
Customer Service.
1
Required Equipment
Meter — Any Orion pH or ion-selective meter, or other pH/lSE
meter with appropriate connectors.
Electrode — Combination pH Electrode, or pH and Reference
Electrode Half Cells. Use the Orion 8003 ROSS™ Sure-Flow®
Reference Half Cell Electrode with a ROSS Half Cell.
Thermometer — Readable to ± 0.5 °C.
Beakers — Plastic or glass.
Magnetic Stirrer — Suggested for precision measurements.
Required Solutions
pH Buffers - Two are recommended for precise measurement. The
first near the electrode isopotential point (pH 7) and the second
near the expected sample pH (e.g., pH 4 or 10).
ROSS Internal Filling Solution — 3 M KCl, Orion 810007. Do not
use any filling solution which contains silver. (Electrode damage
may result.)
filling hole
Orion 8175
ROSS
internal reference
pH sensing bulb
filling solution
chamber
Sure-Flow
sleeve junction
Figure 1: Orion 8172 ROSS Sure-Flow Combination
2
USING THE ELECTRODE
Electrode Preparation
1.
Remove the protective shipping cap from sensing element and
save for storage.
2.
Clean any salt deposits from exterior by rinsing with
distilled water.
3.
Uncover filling hole by removing plastic sleeve and add ROSS™
Internal Filling Solution, Orion 810007, to electrode.
See Figure 2.
To maintain an adequate flow rate, the level of filling solution
must cover the end of coil and be at least one inch above the
sample level when immersed. The filling hole should be open
whenever the electrode is in use.
4.
Thoroughly wet the junction by pressing down on the electrode
cap and allowing some of the ROSS Internal Filling Solution to
flow out of the electrode through the junction. Replenish lost
filling solution. See Figure 3.
5.
Shake down the electrode (as a clinical thermometer) to
remove air bubbles.
6.
Soak combination electrode and/or pH half cell in pH Electrode
Storage Solution, Orion 910001, for one hour. Reference
electrodes do not need to be soaked. If Orion pH Storage
Solution is not available, use 200 mL pH 7 buffer to which
about 1 g KCl has been added, as a
temporary substitute.
7.
Connect electrodes to meter.
Figure 2: Filling the ROSS Sure-Flow Electrode
3
Sample Requirements
One of the benefits of the ROSS™ pH Electrodes is that the filling
solution composition may be changed depending on sample
requirements because of the double junction construction. Do not
use solutions containing silver.
The ROSS pH Electrode Filling Solution, Orion 810007, is 3 M KCl.
For solutions which precipitate in the presence of chloride ion, the
ROSS pH Electrode could be filled with 10% KNO3, Orion 900003.
In organic solutions a minimum of 20% water must be present in
the sample. If there is a great deal of drift in organic solutions when
using the ROSS Electrode filled with ROSS Internal Filling Solution
(Orion 810007), try filling the ROSS Electrode with a mixture of
methanol and water saturated with KCl.
The major advantage of the ROSS Sure-Flow® Electrode is that the
junction can be cleaned at any time by briefly depressing the cap.
See Figure 3. This can be done whenever necessary. To be sure to
maintain a proper level of filling solution, refill as in step 3 of
Electrode Preparation.
Figure 3: ROSS Sure-Flow Electrode Being Flushed
4
Placement of Removable Sleeve Bulb Guard
The bulb guard can be removed for cleaning or general measurement.
Grasp bulb guard and gently pull. The bulb guard will slide off the
electrode exposing the pH sensing bulb and junction area.
See Figure 4A.
Press on the cap to open junction for easy cleaning.
To replace bulb guard, gently push into place. The bulb guard is
secure without additional turning or fittings. See Figure 4B.
For general measurements the bulb guard can be left in place on the
electrode. However, the bulb guard can contribute to carryover from
solution to solution . When using it, be sure to rinse thoroughly
between standards and samples to prevent carryover. For
measurement in viscous solutions or other solution which may be
retained in the protective guard area, remove the bulb guard for
measurement and calibration. Exposing the pH bulb completely
gives faster response and reduces carryover.
Sure-Flow® Junction
The Sure-Flow junction is operable with or without the bulb guard in
place. Simply press down on the cap to open junction and let fill
solution flow through, removing contamination. Removing the bulb
guard and flushing with distilled water aids in the removal of more
difficult deposits.
O-ring
Figure 4A: Bulb Guard for 8165
O-ring
Figure 4B: Bulb Guard for 8175
5
Measuring Hints
See Figure 5.
•
Always use fresh buffers for calibration. Choose buffers that
are no more than 3 pH units apart.
•
Check electrode slope daily by performing two-buffer
calibration. Slope should be 92 - 102%.
•
Except as noted in Sample Requirements, only use ROSS™
Internal Filling Solution, Orion 810007, for ROSS Combination
pH and Reference Electrodes. Do not use any filling solution
which may contain silver.
•
Remove filling hole cover during measurement to ensure
uniform flow of filling solution.
•
Between measurements, rinse the electrodes with distilled
water and then with the next solution to be measure.
•
Stir all buffers and samples
•
Place a piece of insulating material (e.g. styrofoam or
cardboard) between magnetic stirrer and beaker to prevent
error from transfer of heat to sample. Since ROSS Electrodes
respond faster than conventional electrodes, changes in pH
which result from temperature changes will be noticed.
•
Avoid rubbing or wiping electrode bulb, to reduce chance of
error due to polarization.
•
After use in especially dirty or viscous samples or when
electrode response becomes sluggish, empty the electrode
completely and hold the junction open under running water.
Empty any water from the electrode and refill with fresh ROSS
Filling Solution. Briefly flush the junction to ensure that the
junction contains fresh filling solution. Maintain a proper level
of filling solution.
Filling hole should
be uncovered
Fresh pH buffer
Stir all samples
and buffers
Figure 5: measuring Hints
6
Filling solution level
must be higher than
sample level
Reference junction
must be immersed
Place insulation
between stirrer
and beaker
pH CALIBRATION & MEASUREMENT
General Calibration Procedure
For detailed calibration and temperature compensation procedures,
consult your meter instruction manual.
Two-Buffer Calibration
This procedure is recommended for precise measurement.
1.
Ensure that all buffers are at the same temperature. If samples
are at varying temperatures, temperature compensation is
recommended. (See meter instruction manual.)
2.
Select two buffers which bracket the expected sample pH. The
first should be near the electrode isopotential point (pH 7) and
the second near the expected sample pH (e.g., pH 4 or 10)
3.
Rinse electrode first with distilled water and then with the first
(pH 7) buffer. Place the electrode in the first (pH 7) buffer.
4.
Wait for a stable display. Set the meter to the pH value of the
buffer at its measured temperature. (A table of pH values at
various temperatures is supplied on the buffer bottle.) See
Table 1.
5.
Rinse electrode first with distilled water and then with the
second buffer. Place the electrode in the second buffer.
6.
When the display is stable, set meter to the pH value of the
buffer at its measured temperature as described in the meter
instruction manual.
7.
If all steps are performed correctly, proceed to the pH
Measurement section. If any of the above procedures do not
work, see Troubleshooting.
7
Single Buffer Calibration
1.
Ensure that all buffers are at room temperature.
If samples are at varying temperatures, temperature
compensation is recommended. (See meter
instruction manual.)
2.
Set up meter according to meter instruction manual.
3.
Rinse electrode first in distilled water and then with the
buffer being used for calibration (the buffer should be near the
expected sample pH). Place the electrode in the buffer.
4.
Wait for a stable display. Set the meter to the pH value of the
buffer at its measured temperature. See Table 1. (A table of pH
values at various temperatures is supplied on the buffer bottle.)
Proceed to pH Measurement section.
pH Measurement
1.
Calibrate the electrode as described in above procedure.
2.
Rinse the electrode with distilled water and then with sample.
3.
Place the electrode in the sample.
4.
When the display is stable, record sample pH.
Electrode Maintenance
1.
Inspect the electrode for scratches, cracks, salt crystal
build-up, or membrane/junction deposits.
2.
Rinse off any salt build-up with distilled water, and remove any
membrane/junction deposits by holding junction open under
running distilled water.
3.
Drain the reference chamber, flush it with fresh ROSS® Internal
Filling Solution, Orion 810007, and refill chamber.
Cleaning Electrode
General — Soak in 0.1 M HCl or HNO3 for half an hour, followed
by soaking in pH Storage Solution for at least one hour.
8
Removal of Membrane/Junction Deposits
When using the following procedures, do not immerse electrode
more than 1/4" above junction.
Protein — Soak in 10% pepsin in 0.1 M HCl for 15 minutes.*
lnorganic — Soak in 0.1 M tetrasodium EDTA solution for
15 minutes.*
Grease and Oil — Rinse with mild detergent or methanol solution.*
* After any of these cleaning procedures, hold junction open under running distilled
water, drain and refill the reference chamber and soak the electrode in pH Storage
Solution for 15 minutes.
Electrode Storage
To ensure a quick response and free-flowing liquid junction, the
sensing element and reference junction must not be allowed to
dry out.
Short-Term Storage (up to one week)
Soak electrode in pH Electrode Storage Solution, Orion 910001. If
Orion Storage Solution is not available, use about 200 mL pH 7
buffer to which about 1 g KCl has been added, as a temporary
substitute.
Long-Term Storage
The reference chamber should be filled and the filling hole covered.
Cover the sensing element and reference junction with its protective
cap containing a few drops of pH Storage Solution. Before returning
the electrode to use, prepare it as a new electrode.
9
Table 1
pH Values of Buffers at Various Temperatures
Nominal value
at 25 °Temperature
Buffer
0 °C
5 °C
10 °C
20 °C
30 °C
1.68
1.67
1.67
1.67
1.67
1.68
3.78
3.86
3.84
3.82
3.79
3.77
4.01
4.00
4.00
4.00
4.00
4.02
6.86
6.98
6.95
6.92
6.87
6.85
7.00
7.11
7.08
7.06
7.01
6.98
7.41
7.53
7.50
7.47
7.43
7.40
9.18
9.46
9.40
9.33
9.23
9.14
10.01
10.32
10.25
10.18
10.06
9.97
40 °C
50 °C
60 °C
70 °C
80 °C
90 °C
1.69
1.71
1.72
1.74
1.77
1.79
3.75
3.75
4.04
4.06
4.09
4.13
4.16
4.21
6.84
6.83
6.84
6.85
6.86
6.88
6.97
6.97
6.97
6.99
7.03
7.08
7.38
7.37
9.07
9.01
8.96
8.92
8.89
8.85
9.89
9.83
10
TROUBLESHOOTING
Troubleshooting Guide
Following is a systematic procedure to isolate the problem.
The pH measuring systems can be divided into four components for
ease in troubleshooting: pH Meter, Electrodes, Sample/Application,
and Technique.
pH Meter
The meter is the component which is easiest to eliminate as a
possible cause of error. Orion pH meters are provided with an
instrument checkout procedure and shorting cap for convenience in
troubleshooting. Consult your pH meter instruction manual
for directions.
Electrodes
To test electrode operation:
1.
Connect electrode to a working meter.
2.
Set function switch to absolute mV mode.
3.
Immerse electrode in fresh pH 7 buffer.
4.
Displayed value should be 0 ± 30 mV.
5.
Rinse electrode and immerse in fresh pH 4 buffer.
6.
Displayed value should be approximately 160 - 180mV greater
than in step 4. (Actual mV values may change as electrode
ages but mV differences will remain 160 to 180 mV).
If the electrode fails this procedure, clean thoroughly as directed in
Maintenance.
If electrode response is slow or drifting, drain and refill with fresh
ROSS™ Internal Filling Solution, Orion 810007. See Measuring
Hints.
If cleaning and maintenance fail to rejuvenate the electrode:
1.
For separate pH and reference half cells, substitute each
electrode (one at a time) with a known working electrode and
repeat test procedure. By process of elimination, determine
which electrode should be replaced.
2.
For combination pH electrodes, replace the entire electrode.
Sample/Application
The electrode and meter may operate with buffers but not with your
sample. In this case, check sample composition for interferences,
incompatibilities, or temperature effects.
11
Technique
If trouble persists, review operating procedures. Reread calibration
and measurement sections, to be sure proper technique has been
followed.
Assistance
After troubleshooting all components of your measurement system,
contact The Technical EdgeSM for Orion products. Within the United
States call 1.800.225.1480, outside the United States call
978.232.6000 or fax 978.232.6031. In Europe, the Middle East and
Africa, contact your local authorized dealer. For the most current
contact information, visit www.thermo.com.
12
ELECTRODE CHARACTERISTICS
Temperature Effects
The most common cause of error in pH measurement is temperature.
Ordinary electrodes drift with temperature changes. The Ross pH
Electrode eliminates the stability problems associated with the use of
conventional electrodes in samples of varying temperatures.
There are, however, two effects of temperature change that should
be kept in mind.
1.
Electrode slope will change with varying temperature. This
slope change may be compensated for either manually, or,
automatically with an automatic temperature compensator
(ATC) probe and properly designed pH meter. Consult your pH
meter instruction manual for details.
2.
Buffer and sample pH values vary with temperature because of
their temperature dependent chemical equilibrium. The
problem of differing pH values is easily solved by calibrating
the electrode with characterized standard buffers whose true
pH values at different temperatures are known. Buffer values at
different temperatures are given in Table 1. The problem of the
sample equilibrium varying with temperature in an
uncharacterizable manner will always remain. Therefore, pH
values should be reported along with the temperature at which
the measurement was made.
Electrode Leak Rate
The ground glass junction of the ROSS™ Sure-Flow® Electrode has
been optimized to leak at a rate of approximately 1 mL per 24 hour
period. In order to keep the junction free, the leak rate is slightly
higher than conventional electrodes. The loss of filling solution is
minimal during the average time for a pH measurement and does
not contaminate samples.
13
Interferences
Sodium ion is the principal interference for the pH electrode,
causing increasing error at higher pH (lower hydrogen ion activities)
and at higher temperatures. Because the ROSS™ pH membrane is
composed of special low-sodium error glass, error due to sodium is
negligible when measuring at pH values less than 12. When
measuring at pH values greater than 12, add the correction value
from the nomograph in Figure 6 to the observed pH reading.
Sample
pH reading
pH correction
to be added
°C 20
25
0.1 M
30
13
0.5 M
1M
40
50
0.005
sample
sodium
concentration
0.01
2M
60
12
0.02
70
0.03
5M
20°C
25
80
0.1 M
30
0.08
40
11
0.15
50
1M
60
2M
70
10
80
5M
Figure 3: Typical Sodium Error Observed at pH >12
14
0.05
0.06
0.10
0.5 M
Example:
pH reading
Sodium concentration
Temperature
Correction
Corrected pH reading
0.04
12.10
0.5N
50 ˚C
0.01
12.11
0.20
0.25
0.30
0.40
0.50
0.60
0.70
WARRANTY
For the most current warranty information, visit www.thermo.com.
The Thermo Electron Corporation, Orion products warranty covers
failures due to manufacturer’s workmanship or material defects
from the date of purchase by the user. User should return the
warranty card and retain proof of purchase. Warranty is void if
product has been abused, misused, or repairs attempted by
unauthorized persons.
Warranties herein are for product sold/installed by Thermo or its
authorized dealers.
Any product sold by a U.S. or Canadian distributor must be
returned to Thermo for any warranty work. Please contact our
Technical Service department for further information. A Return
Authorization Number must be obtained from The Technical EDGESM
For Orion Products before returning any product for in-warranty
repair or replacement.
In the event of failure within the warranty period, Thermo will at the
company’s option, repair or replace product not conforming to this
warranty. There may be additional charges, including freight, for
warranty service performed in some countries. For service, call
Thermo or its authorized dealer outside the United States and
Canada. Thermo reserves the right to ask for proof of purchase,
such as the original invoice or packing slip.
Field Service is available on Orion BOD AutoEZ™, EZ Flash® GC
Accessory and TEA Analyzer®. Contact our Field Service department
for details on quotations, service, other field service-related
activities.
The following products are warranted to be free from defects in
material and workmanship in the period listed below from the date
of purchase from the user or from the date of shipment from
Thermo, whichever is earlier, provided use is in accordance with the
operating limitations and maintenance procedures in the instruction
manual and when not having been subjected to accident, alteration,
misuse, abuse or breakage of electrodes:
Thirty-six months from date of purchase by the user (or forty-two
months from date of shipment from Thermo)
•
Waterproof Meters (Orion 630, 635, 830A, 835A, 260A, 261S,
265A, 266S, 130A, 131S, 135A, 136S, 1230, 142 and 842),
Conductivity Meters (Orion 105Aplus™, 115Aplus™, 125Aplus™,
145Aplus™, 150Aplus™ and 162A), PerpHect® pH/ISE Meters
(Orion 310, 320, 330, 350, 370) pH/ISE Meters (Orion
15
210Aplus™, 230Aplus™, 250Aplus™, 290Aplus™, 410Aplus™,
420Aplus™, 520Aplus™, 525Aplus™, 710Aplus™, 720Aplus™ and
920Aplus™), pHuture MMS™ Meters (Orion 535A and 555A),
pH/Conductivity Meter (Orion 550A), Dissolved Oxygen Meters
(Orion 805Aplus™, 810Aplus™, 850Aplus™ and 862A).
Twenty-four months from date of purchase by the user (or thirtysix months from date of shipment from Thermo)
•
Orion ROSS Ultra® Electrodes, AQUAfast® IV Colorimeters,
AQUAfast® IV Turbidimeter, Orion 925 Flash Titrator™, Series
100 DuraProbe™ Conductivity Cells and Series 800 Dissolved
Oxygen Probes.
Twelve months from date of purchase by the user (or eighteen
months from date of shipment from Thermo)
•
Laboratory pH Meters, (Orion 301, 611 and 940), SensorLink®,
pHuture™ pH Meters (Orion 610 and 620), Smart Chek™ meters,
Sage® Pumps, Cahn® Balances, 930 Ionalyzer®, 950 ROSS™
FAST QC™ Titrator, 960 Titrator PLUS®, Karl Fischer Titrators,
Autosamplers, Liquid Handling Devices, Liquid Handling
Automation Workstations (Orion AS2000, AS2500 and
AS4000), Pumps (Orion SP201, SP201-HR, SP201-S,
Peristaltic and Rinse), pHuture® Conversion Box, Wine
Master®, 607 Switchbox, rf link™, AQUAfast® II Colorimeters,
Vacuum Degasser and Flowmeter.
•
Orion EZ Flash® GC Accessory, Orion TEA Analyzer® 610 and
510 excluding consumable items carry twelve months warranty
only.
•
Orion Ion Selective Electrodes, ionplus® Electrodes, ROSS™
Electrodes, Sure-Flow® Electrodes, PerpHecT® Electrodes,
AquaPro Professional Electrodes, No Cal™ pH electrodes,
Standard Line pH Electrodes, Tris pH Electrodes, KNIpHE®
electrode, ORP Triode™ (Orion 9180BN), pHuture™ pH Probes
(Orion 616500) and pHuture MMS™ Quatrode™ and Triode™
(Orion 616600 and 617900), Orion 97-08 DO Probe, Series 100
Conventional Conductivity Cells, temperature probes and
compensators (except those products noted).
•
Orion 93 and 97 ionplus Series sensing modules are warranted
to give six months of operation if placed in service before the
date indicated on the package, except 93-07 and 97-07 Nitrate
modules are warranted to give ninety days of operation if
placed in service before the date indicated on the package.
16
Six months from date of purchase by the user (or twelve months
from date of shipment from Thermo)
•
Orion Flash Titration™ Probe (Orion 092518), pHuture™
Electrode (Orion 615700), pHuture MMS™ Pentrode™ (Orion
617500), Quatrode™ (Orion 617800) and Triode™ (Orion
615800), Low Maintenance Triode™ (Orion 9107BN), ORP Low
Maintenance Triode™ (Orion 9179BN), and PerpHecT® Low
Maintenance Triode™ (Orion 9207BN), Waterproof Triode™
(Orion 9107WP, 9107WL, 9109WL and 9109WP), QuiKcheK®
Meters and Micro Electrodes.
Three months from date of purchase by the user (or six months
from date of shipment from Thermo)
•
Economy Line Electrodes, Orion 91-05, 91-06, 91-15, 91-16,
91-25, 91-26, 91-35, 91-36, 92-06. Warranty also includes
failure for any reason (excluding breakage), except abuse,
provided the electrode is not used in solutions containing
silver, sulfide, perchlorate, or hydrofluoric acid; or in solutions
more than one (1) Molar in strong acid or base at temperatures
above 50 °C.
“Out-of-Box” Warranty - Should any of the following products fail
to work when first used, contact Thermo immediately for
replacement.
•
Orion Solutions, Standards, Reagents, Cables, Ferrules, Tubing,
Line adapters, Printers, Software, Cases, Stands, Probe
Membranes, AQUAfast® Test Strips, EZ Flash® columns, Liquid
Handling Probes, Adapter Plates and Racks and general
accessories.
For products in the catalog not listed in this warranty statement,
please visit our website at: www.thermo.com
THE WARRANTIES DESCRIBED ABOVE ARE EXCLUSIVE AND IN
LIEU OF ALL OTHER WARRANTIES WHETHER STATUTORY,
EXPRESS OR IMPLIED INCLUDING, BUT NOT LIMITED TO, ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE AND ALL WARRANTIES ARISING FROM
THE COURSE OF DEALING OR USAGE OF TRADE. THE BUYER’S
SOLE AND EXCLUSIVE REMEDY IS FOR REPAIR OR
REPLACEMENT OF THE NON-CONFORMING PRODUCT OR PART
THEREOF, OR REFUND OF THE PURCHASE PRICE, BUT IN NO
EVENT SHALL THERMO (ITS CONTRACTORS AND SUPPLIERS OF
ANY TIER) BE LIABLE TO THE BUYER OR ANY PERSON FOR ANY
SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
17
WHETHER THE CLAIMS ARE BASED IN CONTRACT, IN TORT
(INCLUDING NEGLIGENCE), OR OTHERWISE WITH RESPECT TO
OR ARISING OUT OF THE PRODUCT FURNISHED HEREUNDER.
REPRESENTATION AND WARRANTIES MADE BY ANY PERSON,
INCLUDING ITS AUTHORIZED DEALERS, REPRESENTATIVES AND
EMPLOYEES OF THERMO WHICH ALTER OR ARE IN ADDITION TO
THE TERMS OF THIS WARRANTY SHALL NOT BE BINDING UPON
THERMO UNLESS IN WRITING AND SIGNED BY ONE OF ITS
OFFICERS.
18
ORDERING INFORMATION
Electrodes
Orion
Description
800300
ROSS™ Sure-Flow® Reference Half Cell Electrode,
Glass Body, with pin-tip connector
8165BN
ROSS Sure-Flow Combination pH Electrode,
Epoxy Body with BNC Connector
8172BN
ROSS Sure-Flow combination pH Electrode,
Glass Body with BNC Connector
8175BN
ROSS Sure-Flow Semi-micro combination pH
Electrode, Epoxy Body with BNC connector
Accessories
Orion
Description
090032
Adaptor: BNC electrode to U.S. Standard meter
810007
ROSS Internal Filling Solution, 3M KCl,
five 50 mL bottles
910001
pH Electrode Storage Solution, 475 mL
910104
pH 4.01 Buffer, 475 mL
910107
pH 7.00 Buffer, 475 mL
910110
pH 10.01 Buffer, 475 mL
910410
perpHect® Buffer pH 4, 10 pk
910425
perpHect Buffer pH 4, 25 pk
910710
perpHect Buffer pH 7, 10 pk
910725
perpHect Buffer pH 7, 25 pk
910110
perpHect Buffer pH 10, 10 pk
910125
perpHect Buffer pH 10, 25 pk
911110
perpHect Electrode Rinse, 10 pk
911125
perpHect Electrode Rinse, 25 pk
19
20
SPECIFICATIONS
pH Range
0 - 14
Drift
Less than 0.005 pH per day
Temperature Range
0 to 100 °C
Internal Reference
ROSS™
Junction
Sure-Flow® liquid-to-liquid
Slope
92 to 102% of theoretical Nernst slope
Isopotential Point
pH 7.0 ± .1
Accuracy of Measuring a pH 6.86 Buffer After Standardization
at 25 °C
Accurate within 0.03 pH for buffer at any other temperature
between 0-100 °C, using automatic temperature compensation
Speed of Response
of pH 6.86 Buffer between 25 °C and 75 °C
Response stable to 0.01 pH within 30 seconds
Speed of Response
Between pH 6.86 and 4.01 Buffers at 25 °C
Response stable to 0.005 pH within 15 seconds
Reference Half Cell Filling Solution
3 M KCl (supplied with electrode)
Size
8003
8165
8172
Electrode Length
(excluding cap) 120 mm
8175
120 mm
120 mm
180 mm
Diameter
12 mm
12 mm
12 mm
7.5 x 100 mm
12 x 80 mm
Cap Diameter
16 mm
16 mm
16 mm
16 mm
Cap Length
50 mm
50 mm
50 mm
50 mm
Cable Length
100 cm
100 cm
100 cm
100 cm
21
NOTES
22
Environmental Instruments
Water Analysis
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www.thermo.com
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Int’l. e-mail: [email protected]
For updated contact information, visit www.thermo.com
Analyze • Detect • Measure • Control™
227355-001 Rev. E